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Clinical validation of a real-time polymerase chain reaction detection of Neisseria gonorrheae porA pseudogene versus culture techniques
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2008 (English)In: Sexually Transmitted Diseases, ISSN 0148-5717, E-ISSN 1537-4521, Vol. 35, no 5, p. 517-520Article in journal (Refereed) Published
Abstract [en]

Background: Diagnosing Neisseria gonorrheae using nucleic acid amplification tests (NAATs) might increase the sensitivity, compared to cultivation. However, using NAATs has also been problematic mainly due to the close genetic relationships between different Neisseria species, resulting in false positive diagnoses. This study was conducted to clinically validate a previously published real-time polymerase chain reaction (PCR) method targeting the porA pseudogene in N. gonorrheae in comparison to culture techniques.

Methods: In total, 360 samples, urethra (n = 109), rectum (n = 84), pharynx (n = 119), and cervix (n = 48) from 185 males and 57 females, were analyzed using porA pseudogene PCR and cultivation. Sequencing of the entire porA pseudogene and the 16S rRNA gene were used to resolve discrepant results.

Results: Of the 360 samples, 37 were positive by both culture and PCR, however, the PCR identified 15 additional confirmed positive samples. The PCR method showed a sensitivity, specificity, positive predictive value, and negative predictive value of 100% in a preselected population. The preselected population had a true gonorrhea prevalence of 17.4%.

Conclusions: The present porA pseudogene real-time PCR comprises a valuable supplement to the traditional culture techniques for diagnosis of N. gonorrheae, especially for samples from extragenital sites such as pharynx and rectum.

Place, publisher, year, edition, pages
Philadelphia: American Venereal Disease Association , 2008. Vol. 35, no 5, p. 517-520
Keywords [en]
Culture Techniques/*methods, DNA; Bacterial/analysis, Female, Gonorrhea/*diagnosis/microbiology, Humans, Male, Neisseria gonorrhoeae/*genetics, Polymerase Chain Reaction/*methods, Porins/*genetics, Predictive Value of Tests, Pseudogenes/genetics
National Category
Medical and Health Sciences Microbiology in the medical area
Research subject
Microbiology
Identifiers
URN: urn:nbn:se:oru:diva-3469DOI: 10.1097/OLQ.0b013e3181644bc9PubMedID: 18434945OAI: oai:DiVA.org:oru-3469DiVA, id: diva2:137766
Available from: 2008-12-08 Created: 2008-12-08 Last updated: 2018-01-13Bibliographically approved

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Publisher's full textPubMedhttp://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Retrieve&list_uids=18434945&dopt=Citation

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Unemo, Magnus

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